ZyXEL Communications ZYWALL USG 2000 Manual page 436

Chapter 27 L2TP VPN Example
17 Select Require Security and click Next. Then click Finish and Close.
Figure 306 IP Security Policy Properties: IP Filter List
18 In the Console window, right-click L2TP to ZyWALL and select Assign.
Figure 307 Console: L2TP to ZyWALL Assign
27.6.2.3 Configure the Windows 2000 Network Connection
After you have configured the IPSec policy, use these directions to create a
network connection.
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ZyWALL USG 2000 User's Guide